Lane Keeping Assist

We have just replaced our 15 year old VW Touran diesel with a T-Cross 1.0 TSi. This is, as all new cars, fitted with lane keeping assist. I was wondering what would happen if it got confused? Could I, or my wife, fight it and win. Looking at the Bosch variant it either uses the electric power steering, if fitted, or brakes individual wheels using the ESP.

https://www.bosch-mobility.com/en/solutions/assistance-systems/lane-keeping-assist/

“Lane keeping assist uses a video camera to detect the lane markings ahead of the vehicle and to monitor the vehicle's position in its lane. If the vehicle’s distance to the lane markings falls below a defined minimum, the system steps in. In vehicles with electric power steering, it gently, but noticeably countersteers in order to keep the vehicle in the lane. In vehicles without electric power steering, it achieves the same effect by utilizing the electronic stability program (ESP®) to brake individual wheels.

Drivers can override the function at all times, so they retain control of the vehicle. If they activate the turn signal in order to intentionally change lanes or turn, the system does not intervene.”

I am fairly happy with these various assist systems so long as the appropriate risk assessment and performance level calculations have been carried out, so not designed like the Boing anti stall system.

 

Some while ago I started a thread on EVs apparently becoming immobilised due to battery or other failures.

https://engx.theiet.org/f/discussions/28694/evs-immobilised-by-flat-batteries-or-breakdowns

The new car has a DSG transmission and the selector lever is locked in Park when the ignition is switched off. It requires 12V to be available to release it, so flat battery and the car is immobilized. Reading deeply in the handbook it can be released with a screwdriver (supplied with the car but buried under the spare wheel) by opening a flap in front of the (conventional) hand brake lever. Who, other than an Aspergers spectrum engineer, would actually look that up?

  • As an old fogy who's first car had no automation apart from the points and coil providing a spark. Since then I have owned and maintained, mainly my three daughter's, cars with increasing levels of electronics and complexity.  In every case there have been problems caused by damp, connection problems and hardware errors in the clever electronic bits. Given the hostile environment of a car, especially as it gets older, I do not see any attempt being made to ruggedise components by design or manufacture. Many car designs appear to be made to fail with all the connections and computers located where they will get wet when the sunroof drains block or a seal gets damaged or mislaid during maintenance with no attempt being made to damp proof the components. I worked on one car where there had been recalls to stick bits of polythene sheets to stop condensation entering  multiple computers

    The result is that I am concerned  that all these "aids" stand a chance of failing to danger when the car is older irrespective of maintenance. Even if they fail will the driver be expecting them to work and have an incident as a result. I read the odd aircraft accident report and if aircraft systems can fail with all the redundancy,  regulations, testing and strict maintenance schedules and procedures what chance does a car built the lowest price stand when it is few years old.

    My sister in law recently got rid of her new car as she could not work out how to work all the aids that made her feel she had no control over the car and kept sounding warning sounds that she did not know what they were for  and distracted her from driving. 

    I read that people are now questioning the safety of the touch screens for basic controls when compared to simple switches or rotary controls. I must admit I have to look away from the road to alter my heating in my car which I never had to do with the old rotary controls with set positions. 

    I feel that progress is often being made for the sake of progress rather than safety.

  • Interestingly I have been quite happy with the automatic windscreen wipers from VW. The systems on my 15 year old Touran and the new T-Cross seem to be the same and work quite well. There is a sensitivity adjuster on the stalk. I don’t know if other vehicles are so fitted.

    Another interesting new toy is the eco/coast function. When going downhill the clutch is disengaged and the engine drops to idle, I assume to maintain the alternator, power steering, aircon etc. Touching the brakes to reduce the speed re-engages the clutch.

    I wonder if this is actually more efficient than shutting off the fuel and using the potential energy from the decent to keep the engine turning and driving the auxiliary functions?

  • There is a saying: 'Design for design's sake' which I use quite often when referring to cars. The biggest bug bear I have is the super bright lights that a lot of modern cars now have. As I was saying to a colleague the other day, whatever happened to 'dip don't dazzle' ? Nowadays it seems to be either dazzle or super dazzle when it comes to car headlights. 

    Driving home not so long ago and the lights on the car behind me were sooooo bright that it cast a shadow of my own car in front of me making it difficult to see where I was in the road. It was on an unlit country road with no road markings through a wooded area and for good measure it was raining too. I had to slow right down to a snails pace then pull over when I could to let them pass as I just could not see the road in front. 

    Quite often I feel that others have their main beam on permanently only to discover that's their standard lights when they do put their main beam on!  Scream

    And what's with the need for three sets of lights on the front too? 

    And don't get me started with the DRLs........ Joy

  • A lot of the "progress" seems to be chasing after the ever-moving goalposts of the Euro NCAP tests.

    Originally, it was all about crash safety.  A 5* rating meant that you could walk away from a low-speed crash, without being injured or trapped in the car.

    Now it's impossible to get a good rating without a whole raft of electronic driver aids that can't be permanently turned off.  All of that adds cost and complexity to new cars.

    But the use of touch screens for everything is a cost-cutting measure, and does nothing for safety.

  • No sensitivity adjustment on Tesla or Jaguar unless its buried deep in the unfathomable menus.  Sure its sensitivity and not just variable intermittency?

    That's interesting as coasting downhill used to be bad practice and you would fail a driving test for it.  Not being in control of the vehicle - wonder how that gets through?  Most efficient is of course is a battery where you can recover most of the energy and that from braking and save it.

  • Daylight running lights apparently saved a lot of casualties when they were introduced.  I never understood why or how.  Who were these people who could only see a car if it was illuminated?  I suspect we are stuck with them and at least in time it will address the idiots who drive with no lights when its raining or dark.  The current generation of cyclists seems to think its fine not to bother with lights so maybe they should be forced to have DRL

  • The issue I have with DRLs is that it's not applied to the rear lights too.... 

  • I disagree. I think they reduce safety.  Awkward to use - absolutely no standardisation between vehicles - perpetually updated by the manufacturer so even if you found your fog lights once they are somewhere different today.   No one has yet explained to me why it makes sense to make an evil of mobile phones but welcome car touchscreens.

  • Another interesting new toy is the eco/coast function. When going downhill the clutch is disengaged and the engine drops to idle, I assume to maintain the alternator, power steering, aircon etc.

    Not a new idea though, anyone remember the Wartburg? We had one mid '70s, coasting down every hill to save fuel. Wiki article here:- en.wikipedia.org/.../Wartburg_353

  • Paul, on the lower spec models the switch on the stalk is just a variable delay, once you get automatic wiper control it sets the sensitivity.

    Roger, the Rover P4 series also had a freewheel as a transmission and fuel saving idea.